Malicious PDF — malware analysis report

Static analysis result for SHA-256 910f43aabb599258…

MALICIOUS

PDF

72.2 KB Created: 2021-06-02 22:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26af1b692678b5f5bc0a93a26ad7d709 SHA-1: cf85dbec047f3ba8447b78c1e6992acd9c669158 SHA-256: 910f43aabb59925845253e1515d88b42bb6343e8754ea8fba4be6a90c10e1794
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'oniceh.ru', which is likely a malicious domain used for further exploitation or credential harvesting. The document body, though heavily obfuscated, suggests a lure related to 'Zentripetalkraft aufgaben pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/pbw?utm_term=zentripetalkraft+aufgaben+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fe17c2477579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_606e9f2e40519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52db2223-2374-4aeb-ba0b-8f13b7d15dc2/no_fear_shakespeare_king_lear_act_3.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/how_to_clean_yellow_dyson_ball_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1999b3d5-b441-4faa-9e09-e7b50cc3b4c5/six_way_paragraphs_download.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/kugewujugapolana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524632df-0b56-442f-a7f6-5857700b25ff/15377817743.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/femowuzabazuxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa5f79b-1652-4fbb-ba3a-4a8f51b38fc6/64989686546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f043b6d-fa37-4e07-8ab8-6d353712a1a3/viwizagekivinawufu.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/sda_bible_commentary_vol_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31f3a0e-622b-4ec1-8095-a8c17d610959/13698230935.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144493461/juvefewabifurevuwemud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204f18e0-3371-4064-ac9d-039418cf5187/71671918246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8461a16-e667-49d1-9d6d-18285cd55da3/asco_gu_2020_dates.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144471588/how_to_ews_certificate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cab6df-bcf5-4eba-b92d-6da000e76247/pajone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873a349c-949b-4611-8a16-f10152790691/tolubasise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca281c8a-d1a8-4bb9-ace1-7f34912de750/daniel_goleman_inteligencia_emocional_resumen_por_capitulos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 5192 bytes
SHA-256: cdea8564dc62f363e90ff3357c4a961abea9797912096e797ae8551f4027be56
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 12048 bytes
SHA-256: 36c9f1495980d6444861a5d5ee4bedb43ec7b080a3bc85bff711628e1ff09177

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